See http://docs.ansible.com/ansible/playbooks_strategies.html#strategies
This could potentially improve performance.
Signed-off-by: Zack Cerza <zack@redhat.com>
 # a playbook to create the necessary users, groups and
 # sudoer settings needed for ansible to manage a node.
 - hosts: all
+  strategy: free
   # assuming the nodes we run this on will most likely
   # have an ubuntu user already created.
   vars:
 
 ---
 - hosts: pcp
+  strategy: free
   roles:
     - pcp
   become: true
 
 ---
 - hosts: testnodes
+  strategy: free
   roles:
     - common
     - testnode
 
 ---
 - hosts: teuthology
+  strategy: free
   roles:
     - common
     - teuthology